<?php
/**
 * Smarty plugin
 *
 * @package Smarty
 * @subpackage PluginsModifier
 */

/**
 * Smarty truncate modifier plugin
 *
 * Type:     modifier<br>
 * Name:     truncate<br>
 * Purpose:  Truncate a string to a certain length if necessary,
 *               optionally splitting in the middle of a word, and
 *               appending the $etc string or inserting $etc into the middle.
 *
 * @link http://smarty.php.net/manual/en/language.modifier.truncate.php truncate (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 * @param string  $string      input string
 * @param integer $length      length of truncated text
 * @param string  $etc         end string
 * @param boolean $break_words truncate at word boundary
 * @param boolean $middle      truncate in the middle of text
 * @return string truncated string
 */
function smarty_modifier_truncate($str,$len,$etc='...',$charset = 'utf-8',$color='',$strong='0'){
	$new_str = '';	
	$len = intval($len);
	$max_len =  mb_strlen($str,'gb2312');								//gb2312下的可视长途正常
	if($len>0 and $len<$max_len){										//截取长度小于总长度
		$str_len = mb_strlen($str,'utf-8');
		for($i=$str_len;$i--;$i>0){										//从后面截取，截取长度小于等于要求时，此字符为所求！
			$c_str = mb_substr($str,0,$i,'utf-8');
			//echo "<br />[$i]".$c_str;
			if($len >=mb_strlen($c_str,'gb2312')){						//当前截取长小于要求长，就是符合要求的
				$new_str = $c_str.$etc;
				break;			
			}
		}
	}else{
		$new_str = $str;												//直接返回
	}
	if($color)
	$new_str = '<font color="'.$color.'">'.$new_str.'</font>';
	if($strong)
	$new_str = '<strong>'.$new_str.'</strong>';
	return $new_str;
}
 
 
/*function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_words = false, $middle = false)
{
    if ($length == 0)
        return '';

    if (Smarty::$_MBSTRING) {
        if (mb_strlen($string, Smarty::$_CHARSET) > $length) {
            $length -= min($length, mb_strlen($etc, Smarty::$_CHARSET));
            if (!$break_words && !$middle) {
                $string = preg_replace('/\s+?(\S+)?$/' . Smarty::$_UTF8_MODIFIER, '', mb_substr($string, 0, $length + 1, Smarty::$_CHARSET));
            }
            if (!$middle) {
                return mb_substr($string, 0, $length, Smarty::$_CHARSET) . $etc;
            }

            return mb_substr($string, 0, $length / 2, Smarty::$_CHARSET) . $etc . mb_substr($string, - $length / 2, $length, Smarty::$_CHARSET);
        }

        return $string;
    }

    // no MBString fallback
    if (isset($string[$length])) {
        $length -= min($length, strlen($etc));
        if (!$break_words && !$middle) {
            $string = preg_replace('/\s+?(\S+)?$/', '', substr($string, 0, $length + 1));
        }
        if (!$middle) {
            return substr($string, 0, $length) . $etc;
        }

        return substr($string, 0, $length / 2) . $etc . substr($string, - $length / 2);
    }

    return $string;
}*/
